Where is the soybean cyst nematode found?

The soybean cyst nematode (SCN), Heterodera glycines, has been found in most
soybean-producing areas in the world. The SCN was first found in North America in
North Carolina in 1954 and since then has spread to at least 31 soybean-producing
states (Fig. 1) and Canada. In Minnesota, SCN was first detected in 1978 in
Faribault County. By 2010, its presence had been confirmed in 64 counties in the
state (Fig. 2).